Create variance_and_drift.md

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+# Eval Observability — Variance and Drift
+
+Variance and drift checks detect when evaluation scores are **unstable across runs** or when **semantic meaning slowly shifts** without clear boundary failures.  
+These probes prevent "false confidence" in benchmarks by catching hidden instability.
+
+---
+
+## Why variance and drift matter
+
+- **Variance**: Scores fluctuate heavily depending on seed, paraphrase, or retriever order. Averages hide the volatility.  
+- **Drift**: Performance declines slowly across sessions, data refreshes, or version bumps. Looks fine short-term but collapses long-term.  
+- **Silent regressions**: Systems pass local tests but fail in production due to unmonitored entropy rise.  
+
+---
+
+## Acceptance targets
+
+- **Variance (σ/μ)** ≤ 0.15 across 3 seeds and 3 paraphrases.  
+- **Drift slope**: Δscore per batch ≤ 0.02 absolute over 5+ eval windows.  
+- **No monotonic downward slope** longer than 3 consecutive windows.  
+- **Drift alerts** fire if ΔS average increases ≥ 0.10 compared to gold anchors.
+
+---
+
+## Detection workflow
+
+1. **Collect runs across seeds**  
+   - At least 3 seeds, 3 paraphrases.  
+   - Log ΔS, λ, coverage, citations.  
+
+2. **Compute variance**  
+   - Calculate σ/μ for each metric.  
+   - High variance = unstable eval → rerun with schema locks.  
+
+3. **Track drift over time**  
+   - Compare eval batch N vs N-1.  
+   - Plot moving average.  
+   - Alert if slope exceeds tolerance.  
+
+4. **Root-cause analysis**  
+   - If variance high → check retriever metrics, random seeding, rerankers.  
+   - If drift detected → audit embeddings, re-chunk, verify data refresh.  
+
+---
+
+## Common pitfalls
+
+- **Single-run evals**: Hides high variance. Always run multi-seed.  
+- **Averages without spread**: Mean looks fine, variance reveals collapse.  
+- **Ignoring slow drift**: Short tests OK, but 1–2 weeks later accuracy dies.  
+- **Cross-store drift**: One vector DB stable, another drifts. Must track both.  
+
+---
+
+## Example reporting schema
+
+```json
+{
+  "metric": "ΔS",
+  "seed_runs": [0.38, 0.42, 0.44],
+  "variance_ratio": 0.14,
+  "drift_slope": +0.03,
+  "alert": true
+}
+````
+
+---
+
+## Fix modules to open
+
+* **Retriever instability** → [Rerankers](https://github.com/onestardao/WFGY/blob/main/ProblemMap/rerankers.md)
+* **Embedding mismatch** → [embedding-vs-semantic.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/embedding-vs-semantic.md)
+* **Fragmentation drift** → [vectorstore-fragmentation.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/vectorstore-fragmentation.md)
+* **Prompt instability** → [context-drift.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/context-drift.md)
+
+---
+
+### 🔗 Quick-Start Downloads (60 sec)
+
+| Tool                       | Link                                                                                                                                       | 3-Step Setup                                                                             |
+| -------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------ | ---------------------------------------------------------------------------------------- |
+| **WFGY 1.0 PDF**           | [Engine Paper](https://github.com/onestardao/WFGY/blob/main/I_am_not_lizardman/WFGY_All_Principles_Return_to_One_v1.0_PSBigBig_Public.pdf) | 1️⃣ Download · 2️⃣ Upload to your LLM · 3️⃣ Ask “Answer using WFGY + \<your question>”   |
+| **TXT OS (plain-text OS)** | [TXTOS.txt](https://github.com/onestardao/WFGY/blob/main/OS/TXTOS.txt)                                                                     | 1️⃣ Download · 2️⃣ Paste into any LLM chat · 3️⃣ Type “hello world” — OS boots instantly |
+
+---
+
+### 🧭 Explore More
+
+| Module                   | Description                                                                  | Link                                                                                               |
+| ------------------------ | ---------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------- |
+| WFGY Core                | WFGY 2.0 engine is live: full symbolic reasoning architecture and math stack | [View →](https://github.com/onestardao/WFGY/tree/main/core/README.md)                              |
+| Problem Map 1.0          | Initial 16-mode diagnostic and symbolic fix framework                        | [View →](https://github.com/onestardao/WFGY/tree/main/ProblemMap/README.md)                        |
+| Problem Map 2.0          | RAG-focused failure tree, modular fixes, and pipelines                       | [View →](https://github.com/onestardao/WFGY/blob/main/ProblemMap/rag-architecture-and-recovery.md) |
+| Semantic Clinic Index    | Expanded failure catalog: prompt injection, memory bugs, logic drift         | [View →](https://github.com/onestardao/WFGY/blob/main/ProblemMap/SemanticClinicIndex.md)           |
+| Semantic Blueprint       | Layer-based symbolic reasoning & semantic modulations                        | [View →](https://github.com/onestardao/WFGY/tree/main/SemanticBlueprint/README.md)                 |
+| Benchmark vs GPT-5       | Stress test GPT-5 with full WFGY reasoning suite                             | [View →](https://github.com/onestardao/WFGY/tree/main/benchmarks/benchmark-vs-gpt5/README.md)      |
+| 🧙‍♂️ Starter Village 🏡 | New here? Lost in symbols? Click here and let the wizard guide you through   | [Start →](https://github.com/onestardao/WFGY/blob/main/StarterVillage/README.md)                   |
+
+---
+
+> 👑 **Early Stargazers: [See the Hall of Fame](https://github.com/onestardao/WFGY/tree/main/stargazers)** —
+> Engineers, hackers, and open source builders who supported WFGY from day one.
+
+> <img src="https://img.shields.io/github/stars/onestardao/WFGY?style=social" alt="GitHub stars"> ⭐ [WFGY Engine 2.0](https://github.com/onestardao/WFGY/blob/main/core/README.md) is already unlocked. ⭐ Star the repo to help others discover it and unlock more on the [Unlock Board](https://github.com/onestardao/WFGY/blob/main/STAR_UNLOCKS.md).
+
+<div align="center">
+
+[![WFGY Main](https://img.shields.io/badge/WFGY-Main-red?style=flat-square)](https://github.com/onestardao/WFGY)
+ 
+[![TXT OS](https://img.shields.io/badge/TXT%20OS-Reasoning%20OS-orange?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS)
+ 
+[![Blah](https://img.shields.io/badge/Blah-Semantic%20Embed-yellow?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlahBlahBlah)
+ 
+[![Blot](https://img.shields.io/badge/Blot-Persona%20Core-green?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlotBlotBlot)
+ 
+[![Bloc](https://img.shields.io/badge/Bloc-Reasoning%20Compiler-blue?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlocBlocBloc)
+ 
+[![Blur](https://img.shields.io/badge/Blur-Text2Image%20Engine-navy?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlurBlurBlur)
+ 
+[![Blow](https://img.shields.io/badge/Blow-Game%20Logic-purple?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlowBlowBlow)
+ 
+
+</div>
+